Cisco Systems WSC4500XF16SFP, WSC4500X24XIPB, WSC4500XF32SFP manual Power over Ethernet, 1-41

Chapter 1 Product Overview

System Architecture

2800 W AC, 4200 W AC or 1400 W DC) also provide a –48 V circuit (shown as a dashed line) to PoE-enabled switching modules, which is then available to the powered device connected to the switching module.

Note The Supervisor Engine II-Plus TS has internal DC-to-DC converters that use the 12 V circuit to provide PoE to powered devices connected to the Supervisor engine only. If your system has a Supervisor Engine II-Plus TS in slot 1, you still need a PoE-enabled power supply to provide PoE to the other slots.

All Catalyst 4500 series switches support dual power supplies, configurable as combined mode or redundant mode. In combined mode, the switch has available the combined rated wattage of both power supplies, less some expected efficiency loss. In redundant mode, one power supply provides power to the system and the other supply is on standby should there be a failure in either the power supply or the input voltage source it is connected to.

Power over Ethernet

The Cisco Catalyst 4500 Series switches support the Cisco pre-standard and 802.3af standard for PoE on 10/100 or 10/100/1000 ports, enabling customers to support telephones, wireless base stations, video cameras, and other appliances. PoE makes it possible to place devices in unique locations without having to provide new outlets and costly electrical circuits. PoE also enables businesses to isolate critical devices on a single power system so that the entire system can be supported by uninterruptable power supply (UPS) backup.

All new Cisco Catalyst PoE line cards can support 15.4 W of power per port simultaneously. Not only do the cards support the IEEE standard, including the optional power classifications, but the Cisco pre-standard power implementation is also supported to help ensure backward compatibility with existing Cisco powered devices. The cards are compatible with any chassis and supervisor engine. Most importantly, the Catalyst 4500 series switch has the power supplies and accessories to support 15.4 W per port on every port simultaneously in any fully loaded chassis. (This requires an external power shelf or a 4200 W dual-input power supply.)

	Catalyst 4500 Series Switches Installation Guide
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